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Answer:
Speed, v = 5 m/s
Explanation:
We have,
The length of the football field, l = 100 m
A person takes 20 seconds to run its length.
It is required to find the speed of the person with which he should run. The distance covered divided by time taken is called its velocity.

So, the speed of the person is 5 m/s.
The answer is B. It is measured in amperes.
Answer:
The value of charge is 35.3 C
Explanation:
Given:
Force
N
Electric field 
According coulomb's law,

Where
charge that experience a force,
For finding the value of charge,


C
Therefore, the value of charge is 35.3 C
Answer:
<em>4</em><em>1</em><em>8</em><em>4</em><em>0</em><em>0</em><em>0</em><em> </em><em>J</em>
Explanation:
that is the aNSweR